Unsanctioned, underground and uncompromising, says the mixed martial arts title Supremacy MMA. It's also unrated as of now, but if it's got a shattered femur flopping around in it, one can expect the game to be rated M.

That would make Supremacy MMA, from 505 Games, the second major sports game to get a Mature flag from the ESRB in the coming year. Though recent MMA titles like UFC Undisputed and EA Sports MMA held themselves to a T rating, for obvious sales and growth purposes, Supremacy MMA will go for a harder presentation, along the lines of maybe Tekken with a Fight Club edge to it.

Unsanctioned doesn't mean unknown, though, at least in the case of its big star, announced today. Jens Pulver, who fought above his weight in the UFC for years before they finally created a lightweight division (which he promptly won), lends his likeness and backstory to the game.

Pulver is fighting next at XFO 38 in Chicago on Jan. 22, a promotion sponsored, coincidentally - I think not! - by Supremacy MMA. A release date is not yet set for the Xbox 360 and PS3 game, but one should be coming soon.